Quote:
Originally Posted by Baune
I've been told from an BMW specialist, that the no.1 reason for oil spill on a N54 engine, is a bad PCV valve. This creates a higher pressure in the top of the engine, leading to valve cover gasket failure. Sadly many owners just replace the gasket, which will fail soon again.
So very important: Change the PSV valve AND the gasket. You can even by an upgraded breather valve, the won't fail.
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True... This is why i replaced the whole valvecover with the new one... PCV system is built into the valve cover.
Also... that higher pressure can do alot more than just ruin your valve cover gasket. It can also push out and damage crank main seals and cause them to leak aswell. I had a valvecover issue first and after repairing that noticed rear main seal leak aswell.. so went and replaced those aswell...
In this case i would even recommend to just replace valvecover as a precaution if it hasnt been done for a while and car has some put decent miles on. Even if PCV wont cause you issues old valvecover plastic gets brittle and can develop cracks...
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, KW V3 suspension, M3 front control arms, Hardrace RTAB, Michelin Pilot Sport 4S tires.